Lemma 2.4 ([1]}) 
Let \(\gamma >2\) , \(\frac{N}{\gamma ^{\prime }}<q<N\) , \(\alpha =2-\frac{N}{q}\) . There exist
\(C_1,C_2\)  independent of \(R\)  such that
\(\Vert Dw\Vert _{q^*;B_R} \le C_1\Vert D^2w\Vert _{q;B_R}^a[w]_{\alpha ;B_R}^{1-a} + C_2 [w]_{\alpha ;B_R},\qquad \text{where }a=1-\frac{q}{N}<\frac{1}{\gamma }\quad ,\) 
